Transmission Systems with Over-Compounded Voltages

A usual method of calculating a transmission line with transformers, in which the voltage is held constant at both ends by synchronous condensers, is to use the circle diagram method. It is often advisable to use ``over-compounded´´ voltage instead of constant voltage; that is, to increase the voltage as the load increases. Methods of calculation are given in this paper for two cases, first with over-compounded generator voltage and constant receiver voltage, in which case the diagram is a circle, and second, with over-compounded voltage at both generator and receiver, in which case the diagram is an ellipse. Examples are given and the diagrams are shown in Fig. 2. A short discussion is given of the advantages and limitations of using over-compounded voltage.